Please help.

Not to be critical or too opinionated here, but if you are using "supersoil", why are you doing extra feeding? I preach that using super soils like FFOF or RootOrganics, provides all the micro-nutrients you need for the majority of the vegetative state. In most of my grows, the plants look so good, I dont feed till flower. IMO, I would cease the extra feedings, until you pass the 30-40 day mark.. Also, IMO, no need for calmag, if you are using straight tap water, which has those minerals and more. If you want, try distilled water, during this down period, to eliminate the potential mineral overload. Too close to light, would produce splotches, and curling, I would think. - - - Using LED, cant speak about non-LED. Good Luck, and good growing.👍

Looks like a magnesium deficiency to me although you fed the right amount. Too much phosphorus competes with magnesium and calcium so your super soil might have too much P. Make sure the pH is good in your feed (6.3-6.5) and also in your runoff. If your ppms are higher than 1000 in the runoff, I suggest a flush.

Is it an autoflower?

Are your humidity levels too high maybe? and what is your ventilation like? I had some deformed leafs because of this on my grow before.